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Re: QMX successful so far - power chase


 

开云体育

You won't be able to tell the difference in what you might squeeze out. I would quit before you short something out.
Bruce
KS4V

-------- Original message --------
From: "James C. Hall, MD WB4YDL" <heartdoc@...>
Date: 8/28/23 6:02 PM (GMT-06:00)
Subject: [QRPLabs] QMX successful so far - power chase

Hello All:

It appears my QMX build has gone quite well. I used a couple (actually 3) different measurements of power. I used a Elecraft DL-1 dummy load and first the diode detect method. Then I clipped to the anode side of its diode and fed that into my oscilloscope and got those readings. Realizing that the Elecraft DL is a bit different (diode at the 25 ohm end), this made the math different. Also I had to go to high impedance on the ‘scope.

Anyway, power measurements are as follows:

80M - 4.20w on both methods
60M - 4.43w (diode), 4.48w (scope)
40M - 3.88w (diode), 4.07w (scope)
30M - 3.50w (diode), 3.67w (scope)
20M - 3.51w (diode), 3.80w (scope)

I used a cheap Chinese QRP meter and it was 0.25 to 0.5w off everything. I used it just for a sanity check.

Now, in the great watt chase, should I try to go for that extra watt, and how would I go about it ?

73, Jamie
WB4YDL





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